We are doing a reno in our kitchen. It has popcorn ceiling. We would also like to add recessed lighting.
My question is about the vapour barrier. There is currently a 2mm vapour in attic. Can you add a vapour barrier below the existing drywall and add new drywall?
I've never heard or thought of doing that. So great question but the answer is no you cannot place vapour between the drywall. The 2 mil poly is garbage and it's not even close to being a true vapourbarrier that will hold heat in your home and the reverse hold the heat from coming in your home from the attic space. So mould needs a paper source to grow and placing the poly between the drywall will be leaving your attic space wide open for mould problems in the future. You need to remove drywall. 2 mil (sandwich wrap) accoustical seal the perimeter and poly ceiling with 6 mil poly / tape all seams. Then drywall re blowin attic space. Renos should only be done the right way or you'll regret and start all over a few years down the road.
Thanks for the great advice. Looks like I'm taking down some drywall this week end.
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